FILE - In this Friday, May 28, 2021 file photo, a healthcare worker prepares a dose of the Sinovac COVID-19 vaccine during a vaccination session for medical staff who work at private clinics in Caracas, Venezuela. The World Health Organization has issued an emergence use listing for the COVID-19 vaccine made by Sinovac in adults aged 18 and over, the second such authorization it has granted to a Chinese company. In a statement on Tuesday, June 1 the U.N.
In a statement Tuesday, the U.N. health agency said data submitted to its experts showed that two doses of the vaccine prevented people from getting symptoms of COVID-19 in about half of those who got the vaccine. WHO said there were few older adults enrolled in the research, so it could not estimate how effective the vaccine was in people over 60.
In April, a study published by a team of scientists in Brazil confirmed a previously reported efficacy rate of over 50% for Sinovac. A real-world study in Chile in April found an efficacy rate of 67%.
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